Stiffness Calculation

Rigidity of an elastic body to deformation when force is applied externally is called as stiffness. It is the ration of the external force applied to the displacement produced by the force along the same degree of freedom. Rotational stiffness can be defined as ratio of momentum to rotation. The inverse of stiffness is termed as flexibility or pliability. Use this stiffness calculator to find the stiffness, applied force and extension alternatively with the other known values.

Calculate Applied Force and Extension

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k = F / δ F = k x δ δ = F / k Where, k = Stiffness F = Applied Force δ = Extension


Stiffness of any object when a force of 20 N is applied with an extension of 5m.


k = 20 / 5
= 4 N/m

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